The Backley Cap is a five panel cap constructed from 9.4 oz cotton canvas and features structured, reinforced front panels with a firm, flat peak. Metal ventilation eyelets provide breathability, and an adjustable strap at the rear guarantees the perfect fit. One size. head circumference: 54 - 60 cm / 21.3 - 23.6 inch structured - front panels reinforced lined five panel firm, flat peak metal ventilation eyelets adjustable strap square label